Maybe because it's not what's envisioned as happening. Twilight's demon hordes seem to be doing the job perfectly well on their own without active human intervention. Some time all it takes is for 'good' people to do nothing. There may also be a more sinister Hanselstadtian Realpolitik attitude from some quarters - if the demons are busy attacking Slayers they're distracted from turning on everyone else.
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Date: 2009-07-07 07:52 pm (UTC)